J
jacob@senderovitz.dk
Guest
Please find enclosed what appears to be the solution to some problems, that I have been having for almost 4 months with my 260 SE, during which time I have not dared drive the car on a dayli basis, from the fear of it not being quite in a healthy state.
The car:
260 SE (W126), produced November 1985 (the 1986 model). 290.000 kilometers.
The problems/symptoms:
After having run for 15-30 kilometers, the car would start to play tricks on me. It would not react to gas being given; instead of accelerating, it would kind of “cough” and not really react. After this had happened a couple of times (almost always when waiting for a green light at a busy intersection !), it would die completely, and not be easy to start up again.
Another problem was when standing still in “P” or “D” with the brake applied, the engine would start to run unevenly, and eventually start to shake quite a bit, and subsequently die alltogether.
What did I do ?:
As I did not feel I had the time to DIY diagnose and resolve, I sent the car off to the official MB garage. They had it in twice, without resolving the problem.
I then sent the car off to an unofficial MB-specialist shop, who also had it twice. They were also not able to resolve the problem.
During these 4 visits, a large number of hours were spent ($$$), and a lot of components replaced.
Apparently they all had problems reproducing the problem, so they believed it to be fixed every time, they had replaced a component…….
What was done to the car, and which components replaced ?
1) The O-rings around the injection valve-holders were replaced. (did not resolve).
2) Spark plugs, ignition cords, ignition coil (I think the term is) were replaced. (did not resolve).
3) A valve which is part of the fuel-evaporation system was replaced. (did not resolve).
I then had a talk with a third MB-specialist, as well as reading some posts on this forum, which proposed to me that I replace a couple of items, which had not yet been replaced. I purchased these items, and installed them myself.
The following items were replaced:
a. Air filter [003 094 54 04]
b. Active charcoal filter [124 470 03 59] (sitting behind the left front wing)
c. The over voltage relay for the fuel pump [201 540 08 45]
d. 2 sensors located on the engine block (I believe they give data to the injection system on coolant temperature) [they are located at the top of the block, at the rear of the engine], and the temperature sensor, sitting at the pipe which leads air into the air filter. [005 542 10 17, 006 542 77 17, 007 542 21 17]
e. I also replaced the coolant water.
f. I also drilled a very small hole in the gas-filler cap, because very often a vacuum would build up in the tank, which appeared to be somewhat excessive.
The car now works OK again, and I have started to use it regularly on a dayli basis :razz:
I hope that the above can help someone, who may have the same problems.
Brgds Jacob
The car:
260 SE (W126), produced November 1985 (the 1986 model). 290.000 kilometers.
The problems/symptoms:
After having run for 15-30 kilometers, the car would start to play tricks on me. It would not react to gas being given; instead of accelerating, it would kind of “cough” and not really react. After this had happened a couple of times (almost always when waiting for a green light at a busy intersection !), it would die completely, and not be easy to start up again.
Another problem was when standing still in “P” or “D” with the brake applied, the engine would start to run unevenly, and eventually start to shake quite a bit, and subsequently die alltogether.
What did I do ?:
As I did not feel I had the time to DIY diagnose and resolve, I sent the car off to the official MB garage. They had it in twice, without resolving the problem.
I then sent the car off to an unofficial MB-specialist shop, who also had it twice. They were also not able to resolve the problem.
During these 4 visits, a large number of hours were spent ($$$), and a lot of components replaced.
Apparently they all had problems reproducing the problem, so they believed it to be fixed every time, they had replaced a component…….
What was done to the car, and which components replaced ?
1) The O-rings around the injection valve-holders were replaced. (did not resolve).
2) Spark plugs, ignition cords, ignition coil (I think the term is) were replaced. (did not resolve).
3) A valve which is part of the fuel-evaporation system was replaced. (did not resolve).
I then had a talk with a third MB-specialist, as well as reading some posts on this forum, which proposed to me that I replace a couple of items, which had not yet been replaced. I purchased these items, and installed them myself.
The following items were replaced:
a. Air filter [003 094 54 04]
b. Active charcoal filter [124 470 03 59] (sitting behind the left front wing)
c. The over voltage relay for the fuel pump [201 540 08 45]
d. 2 sensors located on the engine block (I believe they give data to the injection system on coolant temperature) [they are located at the top of the block, at the rear of the engine], and the temperature sensor, sitting at the pipe which leads air into the air filter. [005 542 10 17, 006 542 77 17, 007 542 21 17]
e. I also replaced the coolant water.
f. I also drilled a very small hole in the gas-filler cap, because very often a vacuum would build up in the tank, which appeared to be somewhat excessive.
The car now works OK again, and I have started to use it regularly on a dayli basis :razz:
I hope that the above can help someone, who may have the same problems.
Brgds Jacob
